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Communicated by L. Cesari
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Rothe, E.H. An existence theorem in the calculus of variations based on Sobolev's imbedding theorems. Arch. Rational Mech. Anal. 21, 151–162 (1966). https://doi.org/10.1007/BF00266572
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DOI: https://doi.org/10.1007/BF00266572